JPS62118115A - Supporter for roller bearing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a sleeve portion 7 having at least one raceway for a rolling element, and a collar 5 provided on the sleeve portion and having axial mounting holes distributed in the circumferential direction. The present invention relates to a support for a rolling bearing, comprising:

Such a support is known from DE 31 41 073. This known support is a rolling bearing for an automobile wheel having two rows of rolling elements between two inner and outer bearing rings, and both the outer ring and the inner ring have a flange, and are fixed to the vehicle body by the flange.
It also supports the wheels. The flange of the outer ring, which is integral with the sleeve-shaped portion, has axial tapped holes distributed in the circumferential direction for mounting purposes. The impact that heavy wheels often impart to rolling bearings during operation has a strong tilting load as well as a radial force component, and the impact can cause one or more screws to be moved by an axial tensile force. I will tell Tsuba as follows.

The collar is therefore subjected to stronger bending stresses in the region of the drill holes than in the track section, which bending stresses constantly change with the rotation of the wheel. This causes the transition area between the collar and the sleeve part to be subjected to extreme stress, leading to cracking and failure. To counter this, the transition region, more precisely the annular region between the collar and the sleeve part, is not formed with sharp edges, but is rounded with a small radius, which usually occurs automatically during processing. No. 1 of the West German Patent No. 3141073
In the figure, both the flange and the raceway are slightly conical in thickness. However, since both conical surfaces are combed or connected,
There is a possibility that the above-mentioned cracks may occur at this corner.

The same problem occurs in the area of boreholes. In order to machine a screw hole, a cylindrical notch is formed in the part of the raceway that extends in the axial direction to the tsuba, or a sharp edge is created between this notch and the tsuba, resulting in cracks in this corner. This is dangerous and may lead to failure of the rolling bearing.

Such drawbacks occur, for example, in any rolling bearing or rolling bearing unit, if the outer ring or the inner ring has a separate mechanical part, a sleeve part and a collar as corresponding supports.

The object of the invention is to improve the support of the rolling bearing mentioned at the outset in such a way that it can withstand high loads despite a construction that is simpler and more material-saving than usual.

This problem requires that the cross section between at least one of the end surfaces of the collar and one of the outer circumferential surfaces of the sleeve portion be curved to form a concave side surface, or
It has a generally annular transition region that extends in a straight line and at an angle, and in this transition region, a generally partially cylindrical cutout having a diameter larger than that of the mounting hole is provided as an axial continuation of the mounting hole, and the edge of the mounting hole is provided in this notch. The problem is solved by forming a generally spherically curved bottom surface that transitions from the bottom surface to the inner surface of the cutout.

As a result, all highly loaded and critical areas of the support have a continuous material transfer.

The load is thus introduced from the load center in the area of the attachment hole directly into the sleeve part via the transition area, partially avoiding the actual collar, with strongly limited bending deformations. Furthermore, the structure according to the invention does not extend into the transition region, resulting in
A continuous change in the stress curve in the material occurs without any jumps,
No local concentration of stress occurs in the region of the tsuba. In particular, undue overstretching of the individual material regions is avoided by means of pulsed impacts. The transition area between the collar and the sleeve part can have a concave profile or, in the case of extreme loads, a straight bevel, depending on the required strength.

In the latter case, however, a continuous transition of the support into the sleeve part can be created, for example by a curved termination with a large radius. Of course, concave curves with a plurality of different radii may be connected in series, or more complex curves of a higher order may be provided. The support according to the invention can have a machined raceway for the rolling elements or a separate raceway. Furthermore, this carrier is suitable both for the inside, ie for the inner raceway, and also for the outer raceway. In this case, the collar can be placed at any point between the ends of the bearing ring, either facing radially inward or outward, depending on the choice, and the transition area can be provided not only on one end face but also on both end faces. can. The above advantages apply to all structures.

In one embodiment of the invention, a transition region is provided that starts from the edge of the collar and transitions to the outer circumferential surface with a gradually increasing radius. This creates a particularly smooth transition over the full height of the tsuba, which is suitable for high loads.

In another embodiment, the inner surface of the partially cylindrical cutout and the outer circumferential surface of the sleeve portion have a common axially extending barrel surface. The radial position and diameter of the recess are designed, on the one hand, so as to be as close as possible to the sleeve part, and on the other hand, so as not to reduce its wall thickness. A relatively small lever arm is then created during the tilting load with respect to the radial position of the mounting hole, which in turn results in an optimal material distribution towards maximum rotational stiffness.

Embodiments of the invention shown in the drawings will be described below.

The illustrated rolling bearing unit has two inner rings 1 connected to each other, two rows of tapered rollers 3, 3 guided through a cage 2, an outer ring 4 made integrally with two raceways, and a radius on the outer ring. It has a flange 5 formed outward in the direction. This collar 5 has axial mounting holes 6 with internal threads distributed in the circumferential direction on the inner periphery. Since the drawing is partially drawn, only one mounting hole 6 is visible. Between the collar 5 and the sleeve part 7 of the outer ring 4 there is a generally annular, concavely curved transition region 8, which increases the strength of the connection between the collar 5 and the sleeve part 7. The transition region 8 starts from the outer edge 9 of the collar 5 and curves with a gradually increasing radius to reach the outer circumferential surface I of the sleeve portion 7.
It extends to O. As an axial continuation of the mounting hole 6, a partially cylindrical recess 11 is machined in the transition region 8, the diameter of which is slightly larger than that of the mounting hole. In the figure, the bottom surface 12 of the partially cylindrical notch 11 at the right end of the mounting hole 6 is formed into a spherical shape, with a flange starting from the edge of the mounting hole 6 and continuing spherically in the radial or axial direction. 5 and into the material part of the transition region 8. The transition into the partially cylindrical cutout 11 is analogous to the transition of the transition region 8 itself into the sleeve part 7.
Cooperative and smooth. The radial arrangement of the mounting hole 6, the partially cylindrical notch 11 extending approximately coaxially with the mounting hole 6, and the diameter of the notch 11 in the axial direction that is closest to the center line of the roller bearing unit [13 is selected so that it transfers to the outer circumferential surface 10 of the sleeve portion 7 at the same level. This results in a straight transition line.

FIG. 2 shows a partial plan view of the roller bearing unit with the mounting hole 6 taken in section. The partially cylindrical cutout 11 is
In this perspective, a generally drop-shaped edge 14 is depicted starting from the transition region 8 . The bottom surface 12 of the notch 11 is spherical, and for the sake of clarity, an imaginary curve 15 connecting the edges of the bottom surface 12 is shown in the attachment hole area with a dashed-dotted line, as in FIG. 1. Of course, the virtual curved surface formed by the dashed-dotted curve 15 does not actually exist, and what does exist is the bottom surface 12 that is connected to the curved surface.

The structure shown is only an example. Of course, the features according to the invention can be provided for any type and shape of bearing.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a rolling bearing unit according to an embodiment of the present invention having a flange on the outer ring, and FIG. 2 is a partially sectional plan view of FIG. 1. In the figure, 3 is a rolling element, 5 is a collar, 6 is a mounting hole, 7 is a sleeve portion, 8 is a transition area, 9 is an edge, 10 is an outer peripheral surface, 11 is a notch portion, and 12 is a bottom surface.

Claims (3)

[Claims] (1) A rolling bearing consisting of a sleeve portion 7 having at least one raceway for the rolling elements 3, and a collar 5 provided in the sleeve portion and having axial mounting holes 6 distributed in the circumferential direction. The support is provided with a generally annular transition region 8 which is curved in cross-section in the form of a concave slope or extends obliquely in a straight line between at least one of the end faces of the collar 5 and one of the outer peripheral surfaces 10 of the sleeve part 7. In this transition region 8, a generally partially cylindrical cutout 11 having a diameter larger than that of the mounting hole is provided as an axial continuation of each mounting hole 6, and the inner surface of the cutout 11 extends from the edge of the mounting hole 6 to the cutout. A support for a rolling bearing, characterized in that a bottom surface 12 is curved into a generally spherical shape. (2) A support according to claim 1, comprising a transition region 8 starting from the edge 9 of the collar 5 and transitioning to the outer circumferential surface 10 with a gradually increasing radius. (3) The inner surface of the partially cylindrical notch 11 and the sleeve portion 7
3. A support according to claim 1, wherein the outer circumferential surface 10 of the support body has a common linear generatrix 13 extending in the axial direction.